No, you didn't miss anything, The Hunter's pet action bar, in the default UI, only has 10 slots for spells. That's all you really need. You just have to "bite-the-bullit" and choose what is necessary. All of the "extraneous" spells would then get put on your "extra pet action bar" and, possibly, key bound.
I can honestly say, though, that when I was able to play, the normal pet action bar was all I ever needed. And I had 49 or 50 characters, with about half of them being Hunters. The rest were a mish-mash of different types of characters. But only two Alliance characters - one of which was a Hunter.
